RU2002102236A - METHOD AND DEVICE FOR QUICK INSTALLATION OF SYNCHRONIZATION IN A WIDE-BAND MULTIPLE ACCESS SYSTEM WITH CODE DIVISION OF CHANNELS - Google Patents

METHOD AND DEVICE FOR QUICK INSTALLATION OF SYNCHRONIZATION IN A WIDE-BAND MULTIPLE ACCESS SYSTEM WITH CODE DIVISION OF CHANNELS

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RU2002102236A
RU2002102236A RU2002102236/09A RU2002102236A RU2002102236A RU 2002102236 A RU2002102236 A RU 2002102236A RU 2002102236/09 A RU2002102236/09 A RU 2002102236/09A RU 2002102236 A RU2002102236 A RU 2002102236A RU 2002102236 A RU2002102236 A RU 2002102236A
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samples
buffer
synchronization
ucs
correlation
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RU2002102236/09A
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RU2250564C2 (en
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Сандип САРКАР
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Квэлкомм Инкорпорейтед
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1. Способ приема сигнала, включающий этапы а) очистки буфера для накопления выборок первичного синхронизирующего кода (ПСК) и буфера для накопления выборок вторичного синхронизирующего кода (ВСК) путем установки их значений в ноль, b) накопления первого набора принимаемых выборок в буфере для накопления выборок ПСК для формирования набора накопленных значений ПСК, с) формирования первой оценки синхронизации временных интервалов на основе содержимого буфера для накопления выборок ПСК, d) накопления второго набора принимаемых выборок в буфере для накопления выборок ВСК для формирования набора накопленных значений ВСК на основе первой оценки синхронизации временных интервалов, e) накопления второго набора принимаемых сигналов в буфере для накопления выборок ПСК, f) выполнения теста для определения достоверности первой оценки синхронизации временных интервалов, g) выполнения первого декодирования ВСК на основе содержимого буфера для накопления выборок ВСК и на основе первой оценки синхронизации временных интервалов, когда тестом подтверждена ее действительность, для формирования набора кодовых символов ВСК, h) выполнения второго декодирования ВСК на основе кодовых символов ВСК для формирования кодового слова ВСК.1. A method of receiving a signal, comprising the steps of a) cleaning the buffer to accumulate samples of the primary synchronization code (UCS) and the buffer to accumulate samples of the secondary synchronization code (VSC) by setting their values to zero, b) accumulating the first set of received samples in the accumulation buffer UCS samples for generating a set of accumulated UCS values, c) generating a first estimate of the synchronization of time intervals based on the contents of the buffer for accumulating UCS samples, d) accumulating a second set of received samples in a buffer re for accumulating SSC samples for generating a set of accumulated SSC values based on the first estimate of time slot synchronization, e) accumulating a second set of received signals in a buffer for accumulating UCS samples, f) performing a test to determine the reliability of the first estimation of time slot synchronization, g) performing the first decoding VSC based on the contents of the buffer for accumulating VSC samples and based on the first estimate of the synchronization of time intervals when the test confirms its validity for forms generating a set of VSC code symbols, h) performing a second decoding of the VSC based on the VSC code symbols to generate the VSC code word. 2. Способ по п.1, отличающийся тем, что накопление выборок на этапе b) выполняют в течение временного интервала заранее установленной длительности.2. The method according to claim 1, characterized in that the accumulation of samples in step b) is performed during a time interval of a predetermined duration. 3. Способ по п.2, отличающийся тем, что заранее установленная длительность равна одному кадру.3. The method according to claim 2, characterized in that the predetermined duration is equal to one frame. 4. Способ по п.2, отличающийся тем, что заранее установленная длительность более чем в три раза превышает длину кадра.4. The method according to claim 2, characterized in that the predetermined duration is more than three times the length of the frame. 5. Способ по п.1, отличающийся тем, что этап с) формирования первой оценки синхронизации временных интервалов дополнительно включает подэтапы с.1) установления корреляции содержимого буфера для накопления выборок ПСК с последовательностью ПСК для получения энергии корреляции ПСК для каждого смещения выборки в буфере для накопления выборок ПСК, и с.2) идентификации смещения выборки, соответствующего наибольшей из энергий корреляции, в качестве первой оценки синхронизации временных интервалов.5. The method according to claim 1, characterized in that step c) generating a first estimate of the synchronization of time intervals further includes sub-steps c.1) establishing a correlation of the contents of the buffer for accumulating UCS samples with the UCS sequence to obtain the correlation energy of UCS for each sample offset in the buffer for the accumulation of UCS samples, and c.2) identification of the bias of the sample corresponding to the highest of the correlation energies as the first estimate of the synchronization of time intervals. 6. Способ по п.5, отличающийся тем, что установление корреляции на подэтапе с.1) выполняют с использованием цифровой согласованной фильтрации.6. The method according to claim 5, characterized in that the correlation in the sub-step c.1) is performed using digital matched filtering. 7. Способ по п.5, отличающийся тем, что этап f) включает подэтапы f.1) деления наибольшей из энергий корреляции на вторую по величине из энергий корреляции для получения отношения энергий корреляции, и f.2) принятия решения о том, что первая оценка синхронизации временных интервалов действительна, если отношение энергий корреляции больше заранее установленного порога для энергий корреляции.7. The method according to claim 5, characterized in that step f) includes sub-steps f.1) dividing the largest of the correlation energies by the second largest of the correlation energies to obtain the ratio of the correlation energies, and f.2) deciding that the first estimate of the synchronization of time intervals is valid if the ratio of the correlation energies is greater than a predetermined threshold for the correlation energies. 8. Способ по п.7, отличающийся тем, что вторую наибольшую из энергий корреляции выбирают из набора энергий корреляции, смещения выборок которого не являются непосредственно смежными к смещению, связанному с наибольшей из энергий корреляции.8. The method according to claim 7, characterized in that the second largest of the correlation energies is selected from a set of correlation energies, the biases of the samples of which are not directly adjacent to the bias associated with the largest of the correlation energies. 9. Способ по п.5, отличающийся тем, что этап с) дополнительно включает сохранение второй по величине энергии корреляции, не связанной с ячейкой, смежной с ячейкой, имеющей наибольшую энергию корреляции, а этап f) включает сравнение энергии корреляции, соответствующей первой оценке синхронизации временных интервалов, со второй по величине корреляцией и принятие решения о том, что первая оценка синхронизации временных интервалов действительна, если отношение наибольшей энергии корреляции ко второй по величине энергии корреляции больше заранее установленного порога для энергий корреляции.9. The method according to claim 5, characterized in that step c) further comprises storing the second largest correlation energy unrelated to the cell adjacent to the cell having the highest correlation energy, and step f) includes comparing the correlation energy corresponding to the first estimate synchronization of time intervals, with the second largest correlation and deciding that the first estimate of synchronization of time intervals is valid if the ratio of the highest correlation energy to the second largest correlation energy is greater than dawn it set the threshold for the correlation energies. 10. Способ по п.1, отличающийся тем, что этап с) дополнительно включает подэтапы с.1) установления корреляции содержимого буфера для накопления выборок ПСК с последовательностью ПСК для получения энергии корреляции для каждого смещения выборки, имеющегося в буфере для накопления выборок ПСК, и запоминания результирующего набора энергий корреляции ПСК в буфере для энергий корреляции ПСК, с.2) установления корреляции содержимого буфера для энергий корреляции ПСК с последовательностью автокорреляции ПСК на основе функции автокорреляции последовательности ПСК для получения энергии согласования автокорреляции ПСК для каждого смещения выборки, имеющегося в буфере для энергий корреляции ПСК, и с.3) идентификации смещения выборки, соответствующего наибольшей из энергий согласования автокорреляции ПСК, в качестве первой оценки синхронизации временных интервалов.10. The method according to claim 1, characterized in that step c) further includes sub-steps c.1) of correlating the contents of the buffer for accumulating UCS samples with the sequence of UCS to obtain the correlation energy for each offset of the sample available in the buffer for accumulating UCS samples, and storing the resulting set of UCS correlation energies in the buffer for UCS correlation energies, p.2) establishing correlation of the contents of the buffer for UCS correlation energies with the UCS autocorrelation sequence based on the last autocorrelation function UCS sequence for obtaining UCS autocorrelation matching energy for each sample bias available in the buffer for UCS correlation energies, and c.3) identification of the sample bias corresponding to the highest of UCS autocorrelation matching energies as the first estimate of time interval synchronization. 11. Способ по п.1, отличающийся тем, что этап f) включает подэтапы f.1) формирования второй оценки синхронизации временных интервалов на основе содержимого буфера для накопления выборок ПСК, и f.2) принятия решения о том, что первая оценка синхронизации временных интервалов действительна, если она равна второй оценке синхронизации временных интервалов.11. The method according to claim 1, characterized in that step f) includes sub-steps f.1) generating a second time slot synchronization estimate based on the contents of the buffer for accumulating UCS samples, and f.2) deciding that the first synchronization estimate time slots is valid if it is equal to the second time slot synchronization estimate. 12. Способ по п.1, отличающийся тем, что этап g) включает подэтапы g.1) повторения этапов с с) по f), пока не обнаружится, что первая оценка является действительной в соответствии с тестом, выполненным на этапе f), g.2) декодирования содержимого буфера для накопления выборок ВСК в символы кода ВСК на основе первой оценки синхронизации временных интервалов.12. The method according to claim 1, characterized in that step g) includes sub-steps g.1) of repeating steps c) to f) until it is found that the first assessment is valid in accordance with the test performed in step f), g.2) decoding the contents of the buffer to accumulate VSK samples into VSK code symbols based on a first estimate of the timing of the time slots. 13. Способ по п.12, отличающийся тем, что по истечении заранее установленного периода времени ожидания ПСК, в течение которого не обнаружено, что первая оценка синхронизации временных интервалов ПСК является действительной, подэтап d.1) прерывается и начинается выполнение способа с этапа а).13. The method according to p. 12, characterized in that after a predetermined time period of the UCS wait, after which it has not been found that the first synchronization estimate of the UCS time intervals is valid, sub-step d.1) is interrupted and the method starts from step a ) 14. Способ по п.12, отличающийся тем, что этап d) включает дополнительную очистку буфера для накопления выборок ВСК путем установки запомненных значений в ноль перед накоплением второго набора принимаемых выборок в буфере для накопления выборок ВСК, причем дополнительную очистку выполняют только тогда, когда первая оценка синхронизации временных интервалов изменилась с предыдущего выполнения этапа d) на большее количество временных интервалов выборок, чем было заранее установлено.14. The method according to p. 12, characterized in that step d) involves additionally flushing the buffer to accumulate VSK samples by setting the stored values to zero before accumulating the second set of received samples in the buffer to accumulate VSK samples, and further purification is performed only when the first time slot synchronization estimate has changed from the previous step d) to a larger number of sample time slots than previously set. 15. Способ по п.14, отличающийся тем, что заранее установленное количество временных интервалов выборок равно нулю.15. The method according to 14, characterized in that the predetermined number of time intervals of the samples is zero. 16. Способ по п.14, отличающийся тем, что заранее установленное количество временных интервалов выборок равно единице.16. The method according to 14, characterized in that the predetermined number of time intervals of the samples is equal to one. 17. Способ по п.1, отличающийся тем, что первое декодирование ВСК включает измерение степени корреляции между каждым символом из набора кодовых символов ВСК и содержимым буфера для накопления выборок ВСК для получения соответствующего набора метрик уровня корреляции.17. The method according to claim 1, characterized in that the first decoding of the VSC includes measuring the degree of correlation between each symbol from the set of VSC code symbols and the contents of the buffer for accumulating the VSC samples to obtain the corresponding set of correlation level metrics. 18. Способ по п.17, отличающийся тем, что второе декодирование ВСК включает декодирование кодового слова ВСК на основе метрик уровня корреляции и использования блочного декодирования с нежестким решением.18. The method according to 17, characterized in that the second decoding VSC includes decoding the VSC code word based on the correlation level metrics and the use of block decoding with a non-rigid solution. 19. Способ по п.18, отличающийся тем, что в блочном декодировании с нежестким решением используют алгоритм Чейза.19. The method according to p. 18, characterized in that in the block decoding with a non-rigid solution using the Chase algorithm. 20. Способ по п.1, отличающийся тем, что этап h) дополнительно включает подэтапы h.1) формирования "предположительно наилучшего" декодированного кодового слова ВСК на основе набора кодовых символов ВСК, h.2) выполнения теста на достоверность для "предположительно наилучшего" декодированного кодового слова ВСК, и h.3) повторения этапов d), g), h.1) и h.2), пока "предположительно наилучшее" декодированное кодовое слово ВСК не пройдет тест на достоверность.20. The method according to claim 1, characterized in that step h) further includes sub-steps h.1) of generating a “supposedly best” decoded codeword of the BSC based on the set of code symbols of the BSC, h.2) performing a validation test for “the presumably best "the decoded VSC codeword, and h.3) repeating steps d), g), h.1) and h.2) until the" supposedly best "decoded VSC codeword passes the validation test. 21. Способ по п.20, отличающийся тем, что этап h) дополнительно включает оценку смещения пилот-сигнала на основе выборок, полученных на подэтапе h.2), и на основе "предположительно наилучшего" декодированного кодового слова ВСК.21. The method according to claim 20, characterized in that step h) further includes estimating the pilot offset based on the samples obtained in sub-step h.2), and based on the “supposedly best” decoded codeword VSC. 22. Способ по п.20, отличающийся тем, что подэтап h.3) прерывают, если истек заранее установленный период времени ожидания ВСК без прохождения набором кодовых символов ВСК теста на достоверность, после чего выполнение способа начинают с этапа а).22. The method according to claim 20, characterized in that the sub-step h.3) is interrupted if a predetermined timeout period of the VSK expires without passing the reliability test by a set of code symbols of the VSK, after which the method starts from step a). 23. Способ по п.20, отличающийся тем, что тест на достоверность включает измерение расстояния Хемминга между набором кодовых символов ВСК и ближайшим циклическим сдвигом действительного кодового слова ВСК и сравнение расстояния Хемминга с заранее установленным максимально допустимым расстоянием Хемминга.23. The method according to claim 20, characterized in that the reliability test includes measuring a Hamming distance between a set of VSK code symbols and the nearest cyclic shift of a valid VSK code word and comparing the Hamming distance with a predetermined maximum allowable Hamming distance. 24. Способ приема сигнала, включающий этапы a) очистки буфера для накопления кадровых выборок путем установки их запомненных значении в ноль, b) накопления принимаемых выборок в буфере для накопления кадровых выборок для формирования набора накопленных значений, и c) выделения данных синхронизации временных интервалов, информации о вторичном синхронизирующем коде (ВСК) и информации пилот-сигнала из набора накопленных значений.24. A method of receiving a signal, comprising the steps of a) cleaning the buffer to accumulate frame samples by setting their stored values to zero, b) accumulating the received samples in a buffer to accumulate frame samples to form a set of accumulated values, and c) extracting time synchronization data, secondary synchronization code (VSC) information and pilot information from a set of accumulated values. 25. Способ по п.24, отличающийся тем, что этап с) дополнительно включает выполнение тестов на достоверность для синхронизации временных интервалов и информации ВСК и повторение этапа b), пока синхронизация временных интервалов и информация ВСК не пройдут тест на достоверность.25. The method according to paragraph 24, wherein step c) further includes performing reliability tests to synchronize the time intervals and the BSC information and repeating step b) until the synchronization of the time intervals and the BSC information passes the reliability test. 26. Устройство для приема сигнала, содержащее а) приемник для преобразования с понижением частоты и дискретизации принимаемого сигнала для получения потока цифровых немодулированных выборок, b) средство обнаружения синхронизации временных интервалов, оперативно связанное с приемником, для одновременного накопления выборок в буфере для накопления выборок временных интервалов и формирования оценок синхронизации временных интервалов на основе содержимого буфера для накопления выборок временных интервалов, c) средство обнаружения вторичного синхронизирующего кода (ВСК), оперативно связанное с приемником и средством обнаружения синхронизации временных интервалов, для одновременного накопления выборок в буфере для накопления выборок ВСК на основе оценок синхронизации временных интервалов и декодирования предположительно наилучшей информации ВСК на основе содержимого буфера для накопления выборок ВСК, d) средство обнаружения смещения пилот-сигнала, оперативно связанное с приемником и средством обнаружения ВСК, для определения смещения пилот-сигнала на основе содержимого буфера для накопления выборок ВСК.26. A device for receiving a signal, comprising a) a receiver for down-converting and sampling a received signal to obtain a stream of digital unmodulated samples, b) means for detecting synchronization of time intervals operatively associated with a receiver for simultaneously accumulating samples in a buffer for accumulating time samples intervals and the formation of estimates of synchronization of time intervals based on the contents of the buffer for the accumulation of samples of time intervals, c) means for detecting second synchronization code (VSC), operatively associated with the receiver and time slot synchronization detection means, for simultaneous accumulation of samples in the buffer for accumulating VSC samples based on estimates of the synchronization of time intervals and decoding the presumably best VSC information based on the contents of the buffer for accumulating VSC samples, d ) means for detecting the offset of the pilot signal, operatively associated with the receiver and means for detecting the VSK, to determine the offset of the pilot signal based on the content direct buffer to accumulate SSC samples. 27. Устройство по п.26, отличающееся тем, что средство обнаружения ВСК содержит коррелятор символов ВСК для формирования символов ВСК и метрик уровня корреляции символов ВСК на основе содержимого буфера для накопления выборок ВСК.27. The device according to p. 26, characterized in that the VSK detection means comprises a VSK symbol correlator for generating VSK symbols and metrics for the correlation level of VSK symbols based on the contents of the buffer for accumulating VSK samples. 28. Устройство по п.27, отличающееся тем, что средство обнаружения ВСК дополнительно содержит декодер ВСК, оперативно связанный с коррелятором символов ВСК, для приема символов ВСК и метрик уровня корреляции символов ВСК и выполнения декодирования с нежестким решением для формирования информации ВСК.28. The device according to item 27, wherein the VSK detection means further comprises a VSK decoder operatively associated with a VSK symbol correlator for receiving VSK symbols and metrics for the correlation level of VSK symbols and performing decoding with a non-rigid solution for generating VSK information.
RU2002102236/09A 1999-06-30 2000-06-28 Method and device for fast synchronization in wide-band code-division multiple access system RU2250564C2 (en)

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